As usual, this isn't NEARLY enough information to say anything for sure, but I have a few thoughts.
First, when you say "intimacy", it sounds like you mean "sex". To most women (in the US at least) "intimacy" means "emotional closeness". Check with her and make sure you aren't just talking past each other. Even if it doesn't solve anything, at least you're talking.
Second, what to you mean by "feminist"? Is that a compliment or an insult? Does she describe herself that way or is it just a word you use when you talk to other people about her, or what? Have you asked her how she feels when you use that word about her?
In any case, I doubt feminism has anything to do with her not wanting you to look at her body. Women are constantly bombarded with impossible standards of beauty, and made to feel ugly in comparison. Odds are she doesn't want ANYBODY to see her naked, and it has nothing to do with you. Have you asked her about that?
Finally, don't hold back because you're afraid of looking dumb. Even if that's exactly how she reacts, you can still ask her why, and what you can do about it. In a relationship, silence is death. If you find you can't talk to her about any of this, then it's time to get some counseling, whether or not she wants to come along.